(Fill in the blanks) Benzoic acid can be extracted into water from an organic solvent using _________ and then removed from the water into an organic solvent by the addition of _________.

  *    A. Sodium bicarbonate / sodium hydroxide
  *    B. Hydrochloric acid / sodium hydroxide
  *    C. Hydrochloric acid / sulfuric acid
  *    D. Sodium hydroxide / hydrochloric acid